M16C6NK Datasheet, PDF (85/404 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/60 SERIES

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M16C/6N Group (M16C/6NK, M16C/6NM)
8. Clock Generating Circuit
Using the PLL clock as the clock source for the CPU
Set the CM07 bit to "0" (main clock), the CM17 to CM16
bits to "00b" (main clock undivided), and the CM06 bit to "0"
(CM16 and CM17 bits enabled). ⁽¹⁾
Set the PLC02 to PLC00 bits (multiplying factor).
(When PLL clock > 16 MHz)
Set the PM20 bit to "0" (2-wait state).
Set the PLC07 bit to "1" (PLL operation).
Wait until the PLL clock becomes stable (tsu(PLL)).
Set the CM11 bit to "1" (PLL clock for the CPU clock source).
END
NOTE:
1. PLL operation mode can be entered from high-speed mode.
Figure 8.11 Procedure to Use PLL Clock as CPU Clock Source
Rev.2.00 Nov 28, 2005 page 67 of 378
REJ09B0124-0200